JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III GROUND WATER DEVELOPMENT AND MANAGEMENT Previous Question Paper (February - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
State the significance of occurrence of groundwater.
Answer
Groundwater is a critical natural resource that serves as a reliable, drought-resistant source of water for irrigation, industrial processes, and public water supply. It plays a vital role in maintaining base flow in rivers and sustaining ecosystems during dry periods.
Define the terms: Porosity, specific yield, specific retention.
Answer
Porosity is the ratio of the volume of voids to the total volume of a geological material. Specific yield is the ratio of the volume of water that a saturated rock or soil will yield by gravity to its own total volume. Specific retention is the ratio of the volume of water a material can retain against gravity to its own total volume.
Mention the applications of groundwater flow contours.
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A ground water basin consists of 25.5 km2 of plains. The maximum fluctuation of groundwater table is 2.75 m. Assuming a specific yield of 20%, determine the available groundwater storage.
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What are leaky aquifers, explain?
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Enumerate the assumptions and limitations of Dupuit’s theory.
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What is a geophone and how is it used in seismic refraction method.
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Discuss the principle of resistivity logging as a sub-surface exploration method.
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Highlight the data obtained in test drilling.
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Explain the measures taken to control and manage the saltwater intrusion.
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Part B
Explain the geological formation of various types of Aquifers.
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Write a detailed note on significance of groundwater in hydrological cycle.
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Illustrate the importance of Zone of Aeration and Zone of Saturation in classification of groundwater.
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Classify the rocks and explain the rock properties affecting the groundwater occurrence.
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Explain the concept of coefficient of permeability and coefficient of Transmissibility.
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Derive the groundwater flow equation in polar coordinate system.
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Illustrate any one experiment conducted to determine the coefficient of Permeability.
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Derive the Darcy’s law. Also state the assumptions, limitations and applications of this equation.
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Explain the concept of interference between two wells.
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A well penetrates fully a 15 m thick water bearing stratum of medium sand having coefficient of permeability of 0.0055 m/sec. The well radius is 15 cm and is to be worked under a drawdown of 4.25 m at the well face. Calculate the discharge from the well. What will be the percentage increase in the discharge if the radius of the well is doubled?
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Derive the governing differential equation for steady groundwater flow towards a well in unconfined aquifer.
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List and explain any one of the sub-surface exploration methods with a neat sketch.
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By means of a case study, discuss the applications of GIS in artificial recharge of groundwater.
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Describe different methods of well drilling, mentioning their merits and suitability for different field conditions.
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Classify the methods of Well construction and explain each in detail with neat sketches.
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